691058 divided by 66 
The aim is to understand the frequency of 66 in 691058.

On to step 1:
When dividing 6 by 66, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 66

On to step 2:
If we divide 69 by 66, we get 1 and a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 66 from 69 and we're left with 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 66

Advancing to step 3:
When dividing 31 by 66, we get 0 with a remainder of 31.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtracting 0 from 31 leaves us with 31.
Grab the next digit (0) from the dividend, add it to 31, then carry on: 310 / 66

Going ahead to step 4:
66 can be fit into 310 4 times, resulting in a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 104.0
Deduct 264 from 310 and we're left with 46.
Append the next digit (5) from the dividend to 46 and continue with: 465 / 66

Step 5:
66 goes into 465 7 times with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 1047.0
The remainder is 3 after subtracting 462 from 465.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 66

On to step 6:
When dividing 38 by 66, we get 0 with a remainder of 38.
The next digit of our result is 0. 
Result so far: 10470.0
Subtract 0 from 38 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 7:
66 goes into 380 5 times with a remainder of 50.
The next digit of our result is 5. 
Result so far: 10470.5
Subtracting 330 from 380 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 8:
When dividing 500 by 66, we get 7 with a remainder of 38.
Put 7 as the next digit of the answer. 
Result so far: 10470.57
Subtracting 462 from 500 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 9:
66 goes into 380 5 times with a remainder of 50.
Write down 5 as next digit of the result. 
Result so far: 10470.575
If we take 330 away from 380, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 10:
66 can be fit into 500 7 times, resulting in a remainder of 38.
The next digit of our result is 7. 
Result so far: 10470.5757
If we subtract 462 from 500, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 11:
66 can be fit into 380 5 times, resulting in a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 10470.57575
Subtract 330 from 380 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 12:
If we divide 500 by 66, we get 7 and a remainder of 38.
Write down 7 as next digit of the result. 
Result so far: 10470.575757
The remainder is 38 after subtracting 462 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 13:
When dividing 380 by 66, we get 5 with a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 10470.5757575
Subtract 330 from 380 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 14:
66 goes into 500 7 times with a remainder of 38.
The number 7 becomes the next digit in our result. 
Result so far: 10470.57575757
Subtracting 462 from 500 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

After the division, we end up with 10470.57575757 and a remainder of 3.8e-08.